Throwing away antimatter via neutrino oscillations during the reheating era
Throwing away antimatter via neutrino oscillations during the reheating era
复制标题
在再加热时代通过中微子振荡扔掉反物质
DOI：
10.1088/1475-7516/2020/03/048
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发表时间：
2020
影响因子：
6.4
通讯作者：
Yin Wen
中科院分区：
文献类型：
--
作者：
Eijima Shintaro;Kitano Ryuichiro;Yin Wen
解释宇宙的重子不对称性的最简单的可能性是假设在暴胀之后，辐射在重子和反重子之间不对称地产生。我们提出了一个新的机制，这种CP违反味振荡的左手轻子在再加热时代分布的轻子不对称部分到右手中微子，而净不对称没有创建。储存在右手中微子中的不对称性后来被轻子数违反衰变所洗掉，最终形成标准模型粒子中的净轻子不对称性，并通过sphaleron过程转化为重子不对称性。这种情况适用于右手中微子的质量范围，而不需要在质量之间进行微调。如果我们假设微扰区的暴胀子衰变是导致再加热的原因，那么宇宙的再加热温度可以低至10 TeV。对于通过耗散效应再加热的情况，再加热温度可以低至100 GeV。
The simplest possibility to explain the baryon asymmetry of the Universe is to assume that radiation is created asymmetrically between baryons and anti-baryons after the inflation. We propose a new mechanism of this kind where CP-violating flavor oscillations of left-handed leptons in the reheating era distribute the lepton asymmetries partially into the right-handed neutrinos while net asymmetry is not created. The asymmetry stored in the right-handed neutrinos is later washed out by the lepton number violating decays, and it ends up with the net lepton asymmetry in the Standard Model particles, which is converted into the baryon asymmetry by the sphaleron process. This scenario works for a range of masses of the right-handed neutrinos while no fine-tuning among the masses is required. The reheating temperature of the Universe can be as low as Ø (10) TeV if we assume that the decays of inflatons in the perturbative regime are responsible for the reheating. For the case of the reheating via the dissipation effects, the reheating temperature can be as low as Ø (100) GeV.